OFDM Multiple Antennas Cognitive Radio Relay CDMA Synchronization Channel Estimation Spectrum Sharing Interference Cancellation Spectrum Sensing Neural Networks Full duplex Resource Allocation Stochastic Geometry Equalizer Bi-Directional Feedback Femtocell Heterogeneous Networks Energy Harvesting Device-to-Device (D2D) Idle cells FBMC HetNet Cell Search Ultra-dense small cell networks Spectral efficiency SINR mismatch problem Simultaneous Sensing and Transmission UWB outage probability Correlated MIMO selection diversity transmission capacity (TC) self-interference cancellation full-duplex relay in-band full-duplex system automatic repeat request (ARQ) achievable sum rate Two-way communications sensing duration Cellular networks mode selection bursty traffic model multi-spectral Handoff full-duplex cellular OQAM Bi-directional full-duplex Shortened TTI Latency Ultra-dense small cell Channel estimation error Heterogeneous channel estimation capability Vehicular and wireless technologies beamforming NOMA LTE-TDD UL grant free Cross-link interference TS-W-OFDM Dynamic TDD Windowing Link adaptation time-frequency efficiency eigen decomposition pilot signal prototype filter Aggregate interference Long Term Evolution-Advanced MU-MIMO GFDM coexistence Iterative decoder Asynchronized system Time spreading singular value decomposition 5G networks interference coordination K-S statistics MIMO Cognitive relay networks